MCQ questions for class 9 Science Chapter 2 Is Matter Around Us Pure
Question 1: Which of the following is a mixture?
Water
Salt
Oxygen
Air
Question 2: What is the process of converting a solid directly into a gas called?
Condensation
Sublimation
Evaporation
Melting
Question 3: Which method is used for the separation of components in a mixture of colors?
Distillation
Filtration
Chromatography
Evaporation
Question 4: What is the process of conversion of a gas into a liquid called?
Condensation
Sublimation
Evaporation
Melting
Question 5: Which of the following is a homogeneous mixture?
Milk
Sand and water
Oil and water
Air
Question 6: Which separation technique is used to separate components of a mixture based on their solubility?
Filtration
Distillation
Evaporation
Fractional crystallization
Question 7: What is the boiling point of pure water at standard atmospheric pressure?
0°C
100°C
273 K
373 K
Question 8: Which of the following is a pure substance?
Air
Lemonade
Gold
Mud
Question 9: Which gas is responsible for the feeling of suffocation in an improperly ventilated room?
Oxygen
Carbon dioxide
Nitrogen
Helium
Question 10: The process of separating the components of a mixture using a solvent is called:
Filtration
Evaporation
Sublimation
Dissolution
Question 11: Which method is suitable for separating a soluble solid from its solution?
Distillation
Filtration
Evaporation
Sublimation
Question 12: The technique used to separate colored components in a mixture is called:
Distillation
Filtration
Chromatography
Evaporation
Question 13: Which of the following is a chemical change?
Melting of ice
Burning of wood
Dissolving salt in water
Mixing oil and water
Question 14: What is the freezing point of pure water at standard atmospheric pressure?
0°C
-10°C
100°C
273 K
Question 15: Which method is used to separate components of a mixture based on their different boiling points?
Filtration
Distillation
Evaporation
Fractional crystallization
Question 16: A solution in which no more solute can be dissolved at a particular temperature is called:
Unsaturated solution
Saturated solution
Dilute solution
Concentrated solution
Question 17: Which of the following is a heterogeneous mixture?
Air
Milk
Honey
Saltwater
Question 18: The technique used to separate a mixture of two immiscible liquids is:
Distillation
Filtration
Decantation
Fractional crystallization
Question 19: What is the process of conversion of a liquid into its vapor below its boiling point called?
Condensation
Evaporation
Sublimation
Melting
Question 20: The substance that is dissolved in a solution is called:
Solute
Solvent
Solution
Solubility
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